A lot of folks are going to tell you you will have issues with the platinum plugs, but I have never had a problem with them.

This may be true if there were still a lot of folks frequenting this place

Regardless ....

My experience with Neons, is that what might work well on one man's car (Bill), won't work as well on another.

An example are some of the endless arguments regarding MTX 'fluids'.
Amsoil.
Redline.
The 1st gen Neon MS9417 fluid.
Mobil One High Mileage.

All of these ^ are good fluids to use in the Neon manual transmission.
Some folks report better results with Amsoil vs. Mobil One High Mileage; another guy will say his results are the exact opposite; and that his trans was quieter / shifted better with Mobil One HM rather than Amsoil; another guy will tell you that Redline is better than all the above; whereas others will say that anyone who runs anything other than MS9417 is a Dunderhead; etc., etc.,, etc., etc., etc., etc., etc., etc.
You get the idea.

The point is:
If your Neon engine is happy with Platinum plugs, then run with them !!
Myself, I will continue to run the good old cheap Champions.